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Getting some brown spots on 1 of 3 Michelangelo feminized from Irie Genetics. 4 weeks since seed drop, Same soil and environmental conditions as the other 2. Got any ideas on fix? Thanks in advance!

Slightly modified Pound House soil, Recharge, Mammoth P, Overgrow, occasional silicon and sporadic IPM, 400 AC watts DIY water cooled LED, 20 pieces CXA2530’s(4-2700,12-3000,4-5000), sealed 2.5 X 5 space with 800-900 ppm Co2, 80-90 F, 55-70 RH.